THIS TRIP IS FULL.  WAITLIST ONLY.  Half-day trip starting at the Blue Mash Nature Trail, where we will look for a variety of songbirds and other species. Then we will drive over to the adjacent Oaks Landfill to look for raptors, Blue Grosbeaks, and possible Dickcissels and Grasshopper Sparrows. Meet at 7 a.m. at 20500 Zion Road, Laytonsville, Md. Limit: 12. LEADER: Mark England at [email protected]